[PATCH] kernel/sys.c: call disable_nonboot_cpus in kernel_restart

On Tue, Sep 04, 2012 at 03:36:24PM -0700, Andrew Morton wrote:

On Mon,  3 Sep 2012 22:24:58 +0800
Shawn Guo [off-list ref] wrote:

quoted

Like kernel_power_off calls disable_nonboot_cpus, we may want to have
kernel_restart call disable_nonboot_cpus as well.  Doing so can help
the machines that require boot cpu be the last alive cpu during reboot
to survive with kernel restart.

That does sound logical.  But the changelog is very vague and fluffy. 
Does this patch actually fix any known problem on any known machine?

Yes, it fixes one reboot issue seen on imx6q (Cortex-A9 Quad).  The
machine requires the restart routine run on primary cpu than secondary
ones.  Otherwise, the secondary core running restart routine will fail
to come to online after reboot.

-- 
Regards,
Shawn